Silent Valley National Park located at a distance of 40 kilometers from Mannarkkad in Kerala, was declared a reserved forest by the Government of Madras in 1914. The Park covers an area of about 77 square kilometers. Butterflies are the main highlight of the Park. The Park is locally known as Sairandhrivanam (the forest in the valley). As the name suggests, there does seem silence in this Park due to the wilderness. But the animals and the birds at the Park are always making sounds. It is difficult to locate animals in this sanctuary because of its thick forests.

The Park has a cool atmosphere because of higher rate of transpiration. Crystal clear perennial River Kunthi flows through the Park and falls from an altitude of 2000 meter above sea level.

The best time to visit the Park is between the months of September and March.